feat: allow marimo configuration in notebook.py as script metadata (per PEP 723)

[mscolnick]

Fixes #2885
Fixes #2774

This adds inline script metadata (PEP 723) support for marimo configuration, similar to our pyproject.toml config.

e.g. can add:

# /// script
# [tool.marimo.runtime]
# auto_instantiate = false
# on_cell_change = "lazy"
# ///

to the top of the script to add per-notebook configuration. the precedence is

Script config > pyproject.toml config > user config

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[akshayka]

This is awesome!

Thoughts on adding

# /// script
# [tool.marimo.runtime]
# auto_instantiate = false
# ///

to notebooks created with marimo convert in a future PR? Since Jupyter notebooks aren't written with automatic execution in mind.

[github-actions]

🚀 Development release published. You may be able to view the changes at https://marimo.app?v=0.11.5-dev2